Proteins and Mutations A quiz on the B3.2 module 'Proteins and Mutations'. 3.0 / 5 based on 1 rating ? BiologyDNA and inheritanceGCSEOCR Created by: Abby LouiseCreated on: 28-10-12 15:55 What is a function of protein? Structural proteins are used to build cells and tissues e,g,- collagen 1 of 12 What is another function of protein? hormones, which carry messages to control a reaction e.g.- insulin controls blood sugar levels 2 of 12 Why are enzymes called a biological catalyst? because they speed up reactions in the body 3 of 12 Enzymes catalyse reactions such as... Protein synthesis, respiration and photosynthesis 4 of 12 The substrate molecule fits into the... Active site 5 of 12 Name two factors that affect enzyme activity pH and temperature 6 of 12 How does temperature affect enzyme activity? Low temperatures- molecules move very slowly so the enzyme and substrate are less likely to collide 7 of 12 How does pH affect enzyme activity? At very high or low pH values, the enzyme active site changes shape (denatures) so the substrate cannot fit 8 of 12 Mutations can be caused by... Radiation/chemicals 9 of 12 A possible effect of mutations is... May lead to the production of different proteins 10 of 12 How do gene mutations alter or prevent the production of proteins that are usually made? They change the base code of DNA and so change the order of amino acids in the protein 11 of 12 Why is it that every cell in the cody has the same genes, but it does not mean that all the same proteins are made? Different genes switch on and off in the cell so different cells perfrom different functions 12 of 12
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